As you know the group 1A elements are also called the Alkali metals and are highly reactive metals because they have only one electron in their valence shell, this means that all prior levels are full and stable, and they have only one electron in the upper level of the valence shell and it is ready to react with any element that is close to it.
Answer from: Quest
Cause its being chemically applied?
Answer from: Quest
☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts
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